// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_COMPOSITOR_LAYER_TREE_OWNER_H_
#define UI_COMPOSITOR_LAYER_TREE_OWNER_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "ui/compositor/compositor_export.h"

namespace ui {

class Layer;

// Scoping object that owns a Layer and all its descendants.
class COMPOSITOR_EXPORT LayerTreeOwner {
public:
    explicit LayerTreeOwner(Layer* root);
    ~LayerTreeOwner();

    Layer* release() WARN_UNUSED_RESULT
    {
        Layer* root = root_;
        root_ = NULL;
        return root;
    }

    Layer* root() { return root_; }
    const Layer* root() const { return root_; }

private:
    Layer* root_;

    DISALLOW_COPY_AND_ASSIGN(LayerTreeOwner);
};

} // namespace

#endif // UI_COMPOSITOR_LAYER_TREE_OWNER_H_
